28 



FUMIGATION INVESTIGATIONS IN CALIFORNIA, 



In figure 11 is shown an outline of a regulation fumigating tent 

 marked after the Morrill system. Three parallel lines and one line 

 at right angles to them are indicated on the tent. The middle one 

 of the tliree parallel lines passes through the central point in the 

 tent canvas, running lengthwise of the central section or strip of 

 which the tent is made and passing over the top of the tent from 

 the edge on one side to the edge on the opposite side; these lines 



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Fig. II. — Outline of a fumigation tent marked according to the Morrill system. 



also run in the direction in which the tent should be pulled on or off 

 a tree. The single line at right angles to the parallel lines passes 

 through the central point, as does the middle one of the three parallel 

 lines, and extends also from the edge on one side to the edge on the 

 opposite side. Beginning at the center these lines are graduated in 

 feet toward either edge of the tent, after the manner shown in the 

 diagram. For tents above 36 feet (average size) it is unnecessary to 

 commence the graduation nearer than 5 feet from the center of the 

 canvas. When one of these lines is over the middle of the tree 



